SSC CGL Chemistry Questions and Answers – Page 5

H group of one amino acid and -NH2 group of another with loss of water. Option A (“Two amino groups”) is incorrect because it does not satisfy the chemical formula, reaction, periodic trend, numerical relation, oxidation state or definition required by the question. Option B (“Two carboxyl groups”) is incorrect because it does not satisfy the chemical formula, reaction, periodic trend, numerical relation, oxidation state or definition required by the question. Option D (“Two hydroxyl groups”) is incorrect because it does not satisfy the chemical formula, reaction, periodic trend, numerical relation, oxidation state or definition required by the question. Identify the governing formula, definition or reaction and apply it consistently. The answer field, correct index and explanation therefore all identify Amino group and carboxyl group. Peptide bond forms between -COOH group of one amino acid and -NH2 group of another with loss of water.

a fungicide used to protect plants from fungal diseases. Option B (“DDT”) is incorrect because it does not satisfy the chemical formula, reaction, periodic trend, numerical relation, oxidation state or definition required by the question. Option C (“BHC”) is incorrect because it does not satisfy the chemical formula, reaction, periodic trend, numerical relation, oxidation state or definition required by the question. Option D (“Malathion”) is incorrect because it does not satisfy the chemical formula, reaction, periodic trend, numerical relation, oxidation state or definition required by the question. The answer field, correct index and explanation therefore all identify Bordeaux mixture. Bordeaux mixture (CuSO4 + Ca(OH)2) is a fungicide used to protect plants from fungal diseases.

e of diffusion is inversely proportional to square root of molecular mass. Option A (“Pressure”) is incorrect because it does not satisfy the chemical formula, reaction, periodic trend, numerical relation, oxidation state or definition required by the question. Option B (“Temperature”) is incorrect because it does not satisfy the chemical formula, reaction, periodic trend, numerical relation, oxidation state or definition required by the question. Option D (“Volume”) is incorrect because it does not satisfy the chemical formula, reaction, periodic trend, numerical relation, oxidation state or definition required by the question. The answer field, correct index and explanation therefore all identify Square root of its molecular mass. Graham's law of diffusion: rate of diffusion is inversely proportional to square root of molecular mass.

sp3d2 hybridization forming octahedral shape. Option A (“sp3”) is incorrect because it does not satisfy the chemical formula, reaction, periodic trend, numerical relation, oxidation state or definition required by the question. Option B (“sp3d”) is incorrect because it does not satisfy the chemical formula, reaction, periodic trend, numerical relation, oxidation state or definition required by the question. Option D (“sp2”) is incorrect because it does not satisfy the chemical formula, reaction, periodic trend, numerical relation, oxidation state or definition required by the question. The answer field, correct index and explanation therefore all identify sp3d2. In SF6 sulphur has 6 bond pairs and no lone pairs. It uses sp3d2 hybridization forming octahedral shape.

ges and smaller ionic radii compared to CaO. Option A (“NaCl”) is incorrect because it does not satisfy the chemical formula, reaction, periodic trend, numerical relation, oxidation state or definition required by the question. Option B (“KCl”) is incorrect because it does not satisfy the chemical formula, reaction, periodic trend, numerical relation, oxidation state or definition required by the question. Option D (“CaO”) is incorrect because it does not satisfy the chemical formula, reaction, periodic trend, numerical relation, oxidation state or definition required by the question. The answer field, correct index and explanation therefore all identify MgO. MgO has highest lattice energy due to Mg2+ and O2- having higher charges and smaller ionic radii compared to CaO.

ct crystal at absolute zero (0 K) is zero. Option A (“Infinity”) is incorrect because it does not satisfy the chemical formula, reaction, periodic trend, numerical relation, oxidation state or definition required by the question. Third law of thermodynamics: entropy of a perfect crystal at absolute zero (0 K) is zero.

Nuclear charge = number of protons = 9. Fluorine has atomic number 9 so it has 9 protons.

on-volatile solute lowers vapour pressure below pure solvent vapour pressure. Option A (“Equal to vapour pressure of solvent”) is incorrect because it does not satisfy the chemical formula, reaction, periodic trend, numerical relation, oxidation state or definition required by the question. Option B (“Greater than vapour pressure of solvent”) is incorrect because it does not satisfy the chemical formula, reaction, periodic trend, numerical relation, oxidation state or definition required by the question. Option D (“Equal to vapour pressure of solute”) is incorrect because it does not satisfy the chemical formula, reaction, periodic trend, numerical relation, oxidation state or definition required by the question. The answer field, correct index and explanation therefore all identify Less than vapour pressure of solvent. Raoult's law: P = x1 P0. Addition of non-volatile solute lowers vapour pressure below pure solvent vapour pressure.

So enthalpy change is positive. Option A (“Negative”) is incorrect because it does not satisfy the chemical formula, reaction, periodic trend, numerical relation, oxidation state or definition required by the question. Option C (“Zero”) is incorrect because it does not satisfy the chemical formula, reaction, periodic trend, numerical relation, oxidation state or definition required by the question. Option D (“Cannot be determined”) is incorrect because it does not satisfy the chemical formula, reaction, periodic trend, numerical relation, oxidation state or definition required by the question. The answer field, correct index and explanation therefore all identify Positive. Conversion of graphite to diamond requires energy input as diamond is less stable than graphite.

AlCl3 FeCl3 are Lewis acids (electrophiles). Option A (“BF3”) is incorrect because it does not satisfy the chemical formula, reaction, periodic trend, numerical relation, oxidation state or definition required by the question. Option B (“AlCl3”) is incorrect because it does not satisfy the chemical formula, reaction, periodic trend, numerical relation, oxidation state or definition required by the question. Option D (“FeCl3”) is incorrect because it does not satisfy the chemical formula, reaction, periodic trend, numerical relation, oxidation state or definition required by the question. The answer field, correct index and explanation therefore all identify H2O. H2O has lone pairs of electrons making it a nucleophile. BF3 AlCl3 FeCl3 are Lewis acids (electrophiles).